# What will happen when aluminum is exposed to air?

Apr 21, 2017

#### Answer:

The aluminium will oxidize..........i.e. it will tarnish quite rapidly........

#### Explanation:

$2 A l \left(s\right) + \frac{3}{2} {O}_{2} \left(g\right) \rightarrow A {l}_{2} {O}_{3}$.

This reaction is quite facile. So how do we use aluminum as a building material? Aluminum rapidly becomes coated with a passivating layer of oxide, that protects the metal from further oxidation.